Sealing device

Abstract

The application provides a sealing device, relates to the technical field of sealing, and aims to solve the technical problem of the failure risk of a spring energy storage sealing ring under extremely high and low temperatures. The sealing device comprises a sealing piece and an elastic assembly. A first sealed body is sleeved on the outside of a second sealed body and forms an annular cavity. The sealing piece is arranged in the annular cavity, and the sealing piece is in contact with a first sealing surface of the first sealed body and a second sealing surface of the second sealed body. The radial distance between the first sealing surface and the second sealing surface can be adjusted in a first direction. The elastic assembly is arranged at the bottom of the sealing piece. The elastic assembly is configured to provide elastic force to the sealing piece when the temperature changes, so that the sealing piece moves in the first direction. The sealing device provided by the application can reduce the failure risk of the sealing piece under extremely high and low temperatures.

Description

Technical Field

[0001] This application relates to the field of sealing technology, and more particularly to a sealing device. Background Technology

[0002] Spring-storage seals are high-performance sealing devices with broad application prospects in ultra-high temperature, ultra-low temperature, corrosive media, and ultra-high pressure conditions.

[0003] The spring-loaded sealing ring mainly consists of a flexible sealing sleeve with an opening and a circumferential spring installed within the opening. The flexible sealing sleeve is made of polytetrafluoroethylene (PTFE), a temperature-sensitive material. At high temperatures, this flexible sealing sleeve softens significantly, resulting in a substantial decrease in stiffness and consequently a significant reduction in sealing force. Conversely, at low temperatures, it hardens significantly, increasing stiffness and enhancing sealing force, but this also leads to severe wear of the flexible sealing sleeve.

[0004] Therefore, when using the above-mentioned spring energy storage seal ring for sealing, its sealing performance is greatly affected by temperature. Under extreme high and low temperatures, the spring energy storage seal ring is at risk of failure, which limits its application in a wide range of high and low temperature conditions. Summary of the Invention

[0005] In view of the above problems, this application provides a sealing device that can reduce the risk of sealing failure of the seal under extreme high and low temperatures and improve the application range of the seal under a wide range of high and low temperature conditions.

[0006] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0007] This application provides a sealing device for sealing a first sealed body and a second sealed body with a medium. The sealing device includes a sealing element and an elastic component. The first sealed body is annular and is sleeved on the outside of the second sealed body, forming an annular cavity between them. The first sealed body has a first sealing surface, and the second sealed body has a second sealing surface. The sealing element is disposed in the annular cavity and arranged circumferentially thereafter. The sealing element contacts the first sealing surface and the second sealing surface respectively, forming a sealing structure. The radial distance between the first sealing surface and the second sealing surface is adjustable along a first direction. The elastic component is disposed at the bottom of the sealing element. Along a second direction, a first end of the elastic component is connected to the first sealed body or the second sealed body, and a second end of the elastic component is connected to the sealing element. The elastic component is configured to provide elastic force to the sealing element when the temperature changes, so that the sealing element moves along the first direction.

[0008] In one alternative embodiment, the elastic component includes at least a first spring sheet and a second spring sheet that are stacked and joined together; the first spring sheet and the second spring sheet have different coefficients of thermal expansion, and when the temperature of the elastic component changes, the second end of the elastic component deforms relative to the first end.

[0009] In one optional embodiment, the sealing element includes a circumferential elastic element and an annular flexible sealing sleeve; the flexible sealing sleeve is provided with a receiving groove along its circumference and forms a first sealing edge and a second sealing edge disposed opposite to each other; the circumferential elastic element is disposed in the receiving groove and contacts the inner sidewalls of the first sealing edge and the second sealing edge respectively; the outer sidewall of the first sealing edge contacts the first sealing surface, and the second sealing edge contacts the second sealing surface.

[0010] In an optional embodiment, the flexible sealing sleeve further includes a root portion; the first sealing edge and the second sealing edge are disposed opposite to each other on the root portion and form the receiving groove, the opening of the receiving groove being opposite to the root portion; the receiving groove and its opening are configured to cooperate with the circumferential elastic member so that the circumferential elastic member is embedded in the receiving groove.

[0011] In one alternative embodiment, a first end of the elastic component is connected to the first sealed body; a second end of the elastic component is connected to the bottom surface of the root.

[0012] In one alternative embodiment, the first sealing surface and / or the second sealing surface are configured as tapered surfaces.

[0013] In one optional embodiment, the coefficient of thermal expansion of the first spring is greater than that of the second spring; the first spring is disposed on the side of the second spring away from the root, and the second spring is in contact with the bottom surface of the root; the taper of the conical surface gradually decreases along the direction from the opening of the receiving groove to the root.

[0014] In one optional embodiment, the coefficient of thermal expansion of the first spring is less than that of the second spring; the first spring is disposed on the side of the second spring away from the root, and the second spring is in contact with the bottom surface of the root; the taper of the conical surface gradually increases along the direction from the opening of the receiving groove to the root.

[0015] In one alternative embodiment, the first sealing surface is a conical surface and the second sealing surface is configured as a wavy surface; or the first sealing surface is configured as a wavy surface and the second sealing surface is a conical surface.

[0016] In one optional embodiment, the first spring and the second spring are respectively configured as plate-like structures; the first spring and the second spring are stacked to form an annular body, the annular body is disposed in the annular cavity and extends circumferentially therein; the projection of the second spring on the first spring coincides with the first spring.

[0017] Compared with related technologies, the sealing device provided in this application has the following advantages:

[0018] The sealing device provided in this application embodiment is used to seal an annular cavity between a first sealed body and a second sealed body. The sealing device includes an elastic component and a sealing element, the sealing element contacting the first sealing surface of the first sealed body and the second sealing surface of the second sealed body respectively to form a sealing structure.

[0019] Along the first direction, the radial distance between the first sealing surface and the second sealing surface is adjustable, and the elastic component is disposed at the bottom of the seal. When the temperature of the elastic component changes, the elastic component deforms and provides elastic force to the seal, causing the seal to move along the first direction, thereby changing the sealing position between the seal and the first and second sealed bodies, thus changing the interference fit of the seal and adjusting the sealing contact force of the seal.

[0020] For example, along the direction from the high-pressure side to the low-pressure side of the medium, the radial distance between the first sealing surface and the second sealing surface gradually decreases. When the seal is in a high-temperature environment, the elastic component deforms, allowing the seal to move downwards in the first direction. This increases the interference fit of the seal, thereby improving the sealing contact force between the seal and the first and second sealed bodies, thus compensating for the decrease in sealing contact force caused by the softening of the seal at high temperatures.

[0021] Conversely, when the flexible sealing sleeve is in a low-temperature environment, the elastic component deforms, allowing the seal to move upward in the first direction. This reduces the interference fit of the seal, thereby decreasing the sealing force between the seal and the first and second sealed bodies. This improves the problem of increased sealing contact force caused by the seal hardening at low temperatures, and alleviates the wear problem caused by increased friction due to excessive sealing contact force.

[0022] In related technologies, the flexible sealing sleeve of the spring energy storage seal ring softens significantly at high temperatures, resulting in a substantial decrease in material stiffness and consequently a significant reduction in sealing force; conversely, it hardens significantly at low temperatures, leading to a substantial increase in stiffness and a significant improvement in sealing force, but also resulting in severe wear of the flexible sealing sleeve. Therefore, the spring energy storage seal ring is at risk of failure under extreme high and low temperatures.

[0023] However, the sealing device provided in this application embodiment has an elastic component at the bottom of the seal. The elastic component can adaptively deform with temperature changes to further adjust the sealing position between the seal and each sealed body, thereby adjusting the interference fit of the seal and adjusting the sealing force between the seal and the sealed body. This keeps the sealing ability of the seal stable, reduces the risk of seal failure in extreme high and low temperature environments, and expands the application range of the seal in a wide range of high and low temperature conditions.

[0024] In addition to the technical problems solved by the embodiments of this disclosure, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that the sealing device provided by the embodiments of this disclosure can solve, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A cross-sectional view of the assembly of the adaptive sealing device with the first sealed body and the second sealed body provided in the embodiments of this application. Figure 1 ;

[0027] Figure 2 A cross-sectional view of the assembly of the adaptive sealing device with the first sealed body and the second sealed body provided in the embodiments of this application. Figure 2 ;

[0028] Figure 3 This is a schematic diagram of the structure of the sealing element provided in the embodiments of this application;

[0029] Figure 4 Schematic diagram of the arrangement of the first sealing surface and the second sealing surface provided in the embodiments of this application. Figure 1 ;

[0030] Figure 5 Schematic diagram of the arrangement of the first sealing surface and the second sealing surface provided in the embodiments of this application. Figure 2 .

[0031] Explanation of reference numerals in the attached figures:

[0032] 10 - Seals;

[0033] 11-Flexible sealing sleeve; 111-First sealing edge; 112-Second sealing edge; 113-Root;

[0034] 12-Circumferential elastic element;

[0035] 20 - Flexible components;

[0036] 21 - First shrapnel; 22 - Second shrapnel;

[0037] 100 - Sealing device;

[0038] 200 - First sealed body;

[0039] 300 - Second sealed body;

[0040] 310 - Conical segment. Detailed Implementation

[0041] The sealing performance of spring-loaded sealing rings in related technologies is significantly affected by temperature. Under extreme high and low temperatures, these rings are at risk of failure. The inventors discovered that this problem arises because the flexible sealing sleeve of the spring-loaded sealing ring is made of temperature-sensitive PTFE material. At high temperatures, this flexible sleeve softens significantly, resulting in a substantial decrease in stiffness and consequently a significant reduction in sealing force. Conversely, at low temperatures, it hardens significantly, increasing stiffness and thus enhancing sealing force.

[0042] However, both excessively high and insufficient sealing force between the flexible sealing sleeve and the sealed body can lead to significant sealing problems. For example, excessively high sealing force increases friction, resulting in significantly increased wear of the flexible sealing sleeve; while insufficient sealing force leads to inadequate sealing capacity and increased leakage rate. Therefore, the sealing performance of spring-energy accumulator seals is greatly affected by temperature, and they are at risk of failure under extreme high and low temperatures.

[0043] To address the aforementioned technical problems, this application provides a sealing device, including an elastic component and a sealing element, wherein the sealing element contacts the first sealing surface of the first sealed body and the second sealing surface of the second sealed body to form a sealing structure.

[0044] Furthermore, the radial distance between the first sealing surface and the second sealing surface is adjustable along the first direction, and the elastic component is disposed at the bottom of the seal. When the temperature of the elastic component changes, the elastic component deforms and provides elastic force to the seal, causing the seal to move along the first direction, thereby changing the sealing position between the seal and the first and second sealed bodies, thus changing the interference fit of the seal and adjusting the sealing contact force of the seal.

[0045] With this configuration, the sealing device provided in this application embodiment has an elastic component at the bottom of the seal. The elastic component can adaptively adjust its deformation with temperature changes, further adjusting the sealing position between the seal and each sealed body, thereby adjusting the interference fit of the seal and adjusting the sealing force between the seal and the sealed body. This ensures that the sealing capacity of the seal remains stable, reducing the risk of seal failure in extreme high and low temperature environments and expanding the application range of the seal under wide range of high and low temperature conditions.

[0046] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0047] like Figure 1 and Figure 2 As shown, the sealing device 100 provided in this application embodiment is used to perform medium sealing on the first sealed body 200 and the second sealed body 300, the medium being a fluid; wherein the first sealed body 200 is annular in shape and is sleeved on the outside of the second sealed body 300, and an annular cavity is formed between the two; in other words, the sealing device 100 provided in this application embodiment can seal the annular cavity.

[0048] In this embodiment, the first sealed body 200 can be an annular shell, and the second sealed body 300 can be a rotating shaft. The first sealed body 200 is sleeved on the rotating shaft, and an annular cavity is formed between the first sealed body 200 and the second sealed body 300. The sealing device 100 is disposed in the annular cavity to seal the fluid on both sides of the annular cavity.

[0049] For ease of description of the embodiments of this application, the Z-axis direction in the figure is defined as the first direction, which is consistent with the direction from the high-pressure side of the fluid to the low-pressure side of the medium, or the first direction is consistent with the axial direction of the second sealed body 300; the X-axis direction is defined as the second direction, which can be the radial direction of the first sealed body 200 and the second sealed body 300; the Y-axis direction is defined as the third direction, which can be the circumferential extension direction of the first sealed body 200 and the second sealed body 300.

[0050] Along the first direction, the first sealed body 200 has an opening on the side facing the high-pressure fluid side, and the opening communicates with the annular cavity. The sealing device 100 provided in this application embodiment includes an elastic component 20 and a sealing element 10, which are respectively disposed in the annular cavity, and the elastic component 20 and the sealing element 10 extend circumferentially along the annular cavity, that is, the elastic component 20 and the sealing element 10 are embedded in the annular cavity circumferentially.

[0051] Furthermore, along the first direction, the elastic component 20 is located on the side of the seal 10 opposite to the high-pressure side of the fluid. Along the second direction, a first end of the elastic component 20 is connected to either the first sealed body 200 or the second sealed body 300, and a second end of the elastic component 20 is connected to the bottom of the seal 10. The elastic component 20 is configured to provide elasticity to the seal 10 when its temperature changes, causing the seal 10 to reciprocate along the direction from the high-pressure side of the fluid to the low-pressure side of the medium.

[0052] It should be noted that the elastic component 20 includes at least a first spring sheet 21 and a second spring sheet 22. The first spring sheet 21 and the second spring sheet 22 have different coefficients of thermal expansion, and they are stacked and combined together. For example, the elastic component 20 includes a first spring sheet 21 and a second spring sheet 22, with the first spring sheet 21 located on one side of the second spring sheet 22, and the two are attached and connected together.

[0053] Because the coefficients of thermal expansion of the first spring piece 21 and the second spring piece 22 are different, when the temperature of the elastic component 20 changes, the deformation of the first spring piece 21 and the second spring piece 22 will be different, causing the elastic component 20 to deform. Since the first end of the elastic component 20 is fixed, when the elastic component 20 deforms, the second end of the elastic component 20 deforms relative to its first end. For example, the second end of the elastic component 20 can be warped to provide elastic force to the seal 10, thereby allowing the seal 10 to move up and down along the first direction.

[0054] It is understood that the elastic component 20 provided in this application embodiment includes multiple elastic sheets stacked together. The elastic sheets can be metal sheets with different coefficients of thermal expansion, so that the elastic component 20 deforms when the temperature of the elastic component 20 changes. This application embodiment does not limit this.

[0055] Furthermore, the first sealed body 200 has a first sealing surface, and the second sealed body 300 has a second sealing surface. For example, a portion of the circumferential surface of the first sealed body 200 is configured as the first sealing surface, and a portion of the circumferential surface of the second sealed body 300 is configured as the second sealing surface, wherein the first sealing surface and the second sealing surface respectively contact the sealing element 10 and form a sealing structure.

[0056] Along the first direction, the radial distance between the first sealing surface and the second sealing surface is adjustable. That is, along the first direction, when the sealing position of the sealing element 10 and the first sealed body 200 and the second sealed body 300 are different, the gap between the sealing element 10 and each sealing surface is different. Thus, the interference of the sealing element 10 can be adjusted with the change of position, and the sealing contact force of the sealing element 10 can be adjusted.

[0057] In some embodiments, the radial distance between the first sealing surface and the second sealing surface gradually decreases along the direction from the high-pressure side of the medium to the low-pressure side of the medium. When the seal 10 is in a high-temperature environment, the elastic component 20 deforms, allowing the seal 10 to move downwards in the first direction. This increases the interference fit of the seal 10, thereby improving the sealing contact force between the seal 10 and the first sealed body 200 and the second sealed body 300, thus compensating for the decrease in sealing contact force caused by the softening of the seal 10 at high temperatures.

[0058] Conversely, when the flexible sealing sleeve is in a low-temperature environment, the elastic component 20 deforms, which allows the seal 10 to move upward in the first direction. This reduces the interference fit of the seal 10, thereby reducing the sealing force between the seal 10 and the first sealed body 200 and the second sealed body 300. This improves the problem of increased sealing contact force caused by the low-temperature hardening of the seal 10, and alleviates the problem of wear caused by increased friction of the seal 10 due to excessive sealing contact force.

[0059] In related technologies, the flexible sealing sleeve of the spring energy storage seal ring softens significantly at high temperatures, resulting in a substantial decrease in material stiffness and consequently a significant reduction in sealing force. Conversely, it hardens significantly at low temperatures, leading to a substantial increase in stiffness and a significant improvement in sealing force, but this also results in severe wear of the flexible sealing sleeve. Therefore, the spring energy storage seal ring is at risk of failure under extreme high and low temperatures.

[0060] However, the sealing device provided in this application embodiment has an elastic component 20 at the bottom of the sealing element 10. The elastic component 20 can adaptively adjust its deformation with temperature changes, further adjusting the sealing position between the sealing element 10 and each sealed body, so as to adjust the interference of the sealing element 10, thereby adjusting the sealing contact force between the sealing element 10 and the sealed body, so as to keep the sealing ability of the sealing element 10 stable, reduce the risk of sealing failure of the sealing element 10 in extreme high and low temperature environments, and improve the application range of the sealing element 10 in a wide range of high and low temperature conditions.

[0061] like Figure 3As shown, the sealing member 10 provided in this embodiment includes a circumferential elastic member 12 and an annular flexible sealing sleeve 11; wherein the flexible sealing sleeve 11 is provided with a receiving groove along its circumference, and forms a first sealing edge 111 and a second sealing edge 112 disposed opposite to each other. The circumferential elastic member 12 is disposed in the receiving groove and contacts the inner sidewalls of the first sealing edge 111 and the second sealing edge 112 respectively. Under the action of the circumferential elastic member 12, the outer sidewall of the first sealing edge 111 contacts the first sealing surface, and the second sealing edge 112 contacts the second sealing surface.

[0062] Specifically, the sealing element 10 can be a spring-loaded sealing ring, which includes an annular flexible sealing sleeve 11 and a circumferential elastic element 12 disposed within the annular flexible sealing sleeve 11; the circumferential elastic element 12 can be a circumferential spring. The flexible sealing sleeve 11 is sleeved on the outside of the rotating shaft and embedded in the annular cavity. For example, the flexible sealing sleeve 11 has an open receiving groove along its circumference. The cross-sectional shape of the receiving groove can be a U-shaped groove or a trapezoidal groove, etc., and this application embodiment does not limit this; this application embodiment uses a U-shaped groove as an example for illustration.

[0063] In this embodiment, the flexible sealing sleeve 11 is provided with a receiving groove, and a first sealing edge 111 and a second sealing edge 112 are formed on both sides of the receiving groove. For example, along the first direction, the opening of the receiving groove is located at the top of the flexible sealing sleeve 11; along the second direction, the flexible sealing sleeve 11 has a first sealing edge 111 and a second sealing edge 112, the first sealing edge 111 and the second sealing edge 112 are configured as the groove wall of the receiving groove, and the first sealing edge 111 is partially attached to the first sealing surface to form a sealing structure, and the second sealing edge 112 is partially attached to the second sealing surface to form a sealing structure.

[0064] Based on the above embodiments, in order to enhance the support of the elastic component 20 for the flexible sealing sleeve 11, the flexible sealing sleeve 11 provided in this application embodiment further includes a root 113. Along the second direction, the first sealing edge 111 and the second sealing edge 112 are respectively disposed on both sides of the root 113, and the first sealing edge 111 and the second sealing edge 112 are disposed opposite to each other. The first sealing edge 111, the second sealing edge 112 and the root 113 form a receiving groove.

[0065] Along the first direction, the elastic component 20 is disposed at the root 113 facing the low-pressure side of the medium. The first end of the elastic component 20 is connected to the first sealed body 200, and the second end of the elastic component 20 is connected to the bottom surface of the root 113. It should be noted that the receiving groove and its opening are configured to cooperate with the circumferential elastic member 12 so that the circumferential elastic member 12 can be embedded into the receiving groove through the opening.

[0066] With this configuration, some of the circumferential elastic elements 12 abut against the root 113, some of the circumferential elastic elements 12 abut against the first sealing edge 111, and some of the circumferential elastic elements 12 abut against the second sealing edge 112. This can increase the contact area between the circumferential elastic elements 12 and the flexible sealing sleeve 11, thereby improving the force transmission effect between the two. This enhances the support strength of the circumferential elastic elements 12 for the flexible sealing sleeve 11 and the adaptive adjustment effect of the sealing contact force.

[0067] Continue reading Figure 1 and Figure 2 In this embodiment, the first sealing surface and / or the second sealing surface are configured as conical surfaces. For example, the first sealed body 200 is configured as a housing, the housing including a circumferential wall panel and a bottom plate, the circumferential wall panel surrounding the bottom plate and forming an annular cavity with an opening on one side. The aforementioned first sealing surface is located on the side of the circumferential wall panel facing the annular cavity. It should be noted that the inner wall of the circumferential wall panel includes at least a partially inclined section, and the first sealing surface is located on the inclined section.

[0068] The second sealed body 300 is configured as a tapered shaft, which includes a tapered section 310. At least a portion of the tapered section 310 is configured as a second sealing surface near the circumferential surface of the seal 10. It should be noted that, in the embodiments of this application, the second sealed body 300 may also be a cylindrical rotating shaft, with a tapered surface provided on a portion of the outer circumferential surface of the rotating shaft to form the second sealing surface. The embodiments of this application do not limit this.

[0069] Preferably, the second sealed body 300 is configured as a tapered shaft, the tapered shaft including a tapered section 310, and the tapered section 310 may be located at one end of the second sealed body 300 near the high-pressure side of the fluid. Along the second direction, the tapered section 310 is disposed opposite to the inclined section of the first sealed body 200, and the sealing member 10 is disposed between the tapered section 310 and the inclined section, forming a sealing structure with the sealing surfaces of the tapered section 310 and the inclined section respectively.

[0070] like Figure 4 and Figure 5 As shown, the first sealing surface is configured as a conical surface, and the second sealing surface is configured as a wavy curved surface; or the first sealing surface is configured as a wavy curved surface, and the second sealing surface is configured as a conical surface; or both the first and second sealing surfaces are configured as conical surfaces. With this configuration, by configuring one of the sealing surfaces as a wavy curved surface and further adjusting the temperature-dependent resilience of the elastic component 20, precise adjustment of the sealing contact force at a specific temperature can be achieved. It is understood that regardless of the structure of the first and second sealing surfaces, at least one sealing surface is configured as a conical surface so that the radial distance between the first and second sealing surfaces is adjustable, and the sealing element 10 can move relative to each sealing surface along a first direction.

[0071] The performance analysis of the corrugated curved surface sealing structure in this application embodiment is as follows:

[0072] By adjusting the thermal deformation characteristics of the elastic component 20, it can be made to exhibit warping deformation at different temperatures. The amount of axial deformation varies at different temperatures. For example, the axial deformation is A1 at temperature A and B1 at temperature B. This axial deformation can be converted into radial interference through the action of the wavy surface. That is, at temperature A, the axial deformation A1 and the radial interference become A2. Similarly, at temperature B, the radial interference is B2. By adjusting the shape of the wavy surface, the values ​​of A1, A2, B1, and B2 can be affected, thereby achieving dynamic adjustment of the interference at different temperatures.

[0073] Furthermore, it can achieve, for example, good sealing performance at room temperature, improved sealing performance when heated to temperature A, and decreased sealing performance when heated to temperature B. It can achieve good sealing performance before reaching a specific temperature, and reduced sealing performance and pressure relief after reaching a specific temperature, thus achieving a certain degree of automatic control effect.

[0074] In this embodiment, both the first and second sealing surfaces are conical surfaces. When the sealing element 10 moves along the first direction, its displacement can be converted into radial deformation of the sealing element 10 through the conical surface, thereby changing the sealing contact force of the sealing element 10.

[0075] This configuration increases the adjustable range of the radial distance of the seal 10, thus meeting the need for adaptive sealing contact force adjustment within a wide temperature fluctuation range. The following explanation, using an example where both the first and second sealing surfaces are conical, illustrates the structural arrangement and fit with the elastic component 20.

[0076] Continue reading Figure 1 In some embodiments, the radial distance between the first sealing surface and the second sealing surface gradually decreases along the direction from the high-pressure side of the medium to the low-pressure side of the medium, that is, the interference of the sealing element 10 gradually decreases along the direction from the high-pressure side of the medium to the low-pressure side of the medium, that is, the taper of the tapered surface gradually decreases along the direction from the groove opening of the receiving groove to the root 113.

[0077] In this case, the elastic component 20 is disposed on the side of the seal 10 facing the low-pressure side of the medium, wherein the coefficient of thermal expansion of the first spring 21 is greater than that of the second spring 22; the first spring 21 is disposed on the side of the second spring 22 away from the root 113, and the second spring 22 is in contact with the bottom surface of the root 113.

[0078] When the seal 10 is in a high-temperature environment, the thermal deformation of the first spring 21 is greater than that of the second spring 22. The thermal deformation difference between the first spring 21 and the second spring 22 causes the elastic component 20 to undergo non-uniform deformation. As a result, the second end of the elastic component 20 tends to move downward in the first direction, which can cause the seal 10 to move downward in the first direction.

[0079] Furthermore, along the direction from the opening of the receiving groove to the root 113, the taper of the tapered surface gradually decreases, thus increasing the interference of the seal 10. This can improve the sealing contact force between the seal 10 and the first sealed body 200 and the second sealed body 300, thereby compensating for the decrease in sealing contact force caused by the softening of the seal 10 due to high temperature.

[0080] Conversely, when the flexible sealing sleeve is in a low-temperature environment, since the thermal deformation of the first spring 21 is less than that of the second spring 22, the thermal deformation difference between the first spring 21 and the second spring 22 causes the elastic component 20 to undergo non-uniform deformation. As a result, the second end of the elastic component 20 tends to move upward in the first direction, which can cause the seal 10 to move upward in the first direction.

[0081] Furthermore, along the direction from the opening of the receiving groove to the root 113, the taper of the tapered surface gradually decreases, thus the interference of the seal 10 gradually decreases, and the sealing contact force between the seal 10 and the first sealed body 200 and the second sealed body 300 decreases. This can improve the problem of increased sealing contact force caused by the low-temperature hardening of the seal 10, and alleviate the problem of wear caused by increased friction of the seal 10 due to excessive sealing contact force.

[0082] like Figure 4 As shown, in another embodiment, the radial distance between the first sealing surface and the second sealing surface gradually increases along the direction from the high-pressure side of the medium to the low-pressure side of the medium, that is, the interference of the sealing element 10 gradually increases along the direction from the high-pressure side of the medium to the low-pressure side of the medium; that is, the taper of the tapered surface gradually increases along the direction from the groove opening of the receiving groove to the root 113.

[0083] In this configuration, the elastic component 20 is positioned on the side of the seal 10 facing the low-pressure side of the medium, wherein the coefficient of thermal expansion of the first spring 21 is less than that of the second spring 22; the first spring 21 is positioned on the side of the second spring 22 facing away from the root 113, and the second spring 22 is in contact with the bottom surface of the root 113. The shape of the elastic component 20 and the sealing position of the seal 10 during temperature changes will not be described further here.

[0084] In one embodiment, the first spring sheet 21 and the second spring sheet 22 provided in this application are both plate-shaped structures. For example, the first spring sheet 21 and the second spring sheet 22 are respectively configured as strip-shaped metal sheets with different coefficients of thermal expansion, and the metal sheets are flat plate structures. The first spring sheet 21 and the second spring sheet 22 are stacked, and the first spring sheet 21 and the second spring sheet 22 are combined together to form a ring. The lengths of the first spring sheet 21 and the second spring sheet 22 need to match the circumference of the annular cavity so that the hollow ring formed by the elastic component 20 can be embedded in the annular cavity.

[0085] Furthermore, in this embodiment, the projection of the second spring 22 onto the first spring 21 coincides with the first spring 21, meaning that the first spring 21 and the second spring 22 have the same length, and the first spring 21 and the second spring 22 can be configured as an integral structure. It should be noted that in this embodiment, the lengths of the first spring 21 and the second spring 22 may be different and can be adjusted as needed; this embodiment does not impose any limitations on this.

[0086] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0087] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0088] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0089] It should be readily understood that the terms “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on top of something” but also “on top of something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A sealing device for sealing a first sealed body and a second sealed body with a medium, characterized in that, The sealing device includes a sealing element and an elastic component; The first sealed body is ring-shaped and is sleeved on the outside of the second sealed body, forming an annular cavity between them; the first sealed body has a first sealing surface, the second sealed body has a second sealing surface, the sealing element is disposed in the annular cavity and arranged circumferentially thereon, the sealing element contacts the first sealing surface and the second sealing surface respectively, and forms a sealing structure; Along a first direction, the radial distance between the first sealing surface and the second sealing surface is adjustable, and the elastic component is disposed at the bottom of the seal; Along the second direction, a first end of the elastic component is connected to the first sealed body or the second sealed body, and a second end of the elastic component is connected to the seal; the elastic component is configured to provide elastic force to the seal when the temperature changes, so that the seal moves along the first direction.

2. The sealing device according to claim 1, characterized in that, The elastic component includes at least a first and a second spring sheet that are stacked and joined together; The first and second springs have different coefficients of thermal expansion. When the temperature of the elastic component changes, the second end of the elastic component deforms relative to the first end.

3. The sealing device according to claim 2, characterized in that, The sealing element includes a circumferential elastic element and a ring-shaped flexible sealing sleeve; The flexible sealing sleeve is provided with a receiving groove along its circumference, and forms a first sealing edge and a second sealing edge that are disposed opposite to each other. The circumferential elastic element is disposed in the receiving groove and contacts the inner sidewalls of the first sealing edge and the second sealing edge respectively; the outer sidewall of the first sealing edge contacts the first sealing surface, and the second sealing edge contacts the second sealing surface.

4. The sealing device according to claim 3, characterized in that, The flexible sealing sleeve also includes a root; The first sealing edge and the second sealing edge are disposed opposite to each other on the root and form the receiving groove, the opening of the receiving groove being opposite to the root; The receiving groove and its opening are configured to cooperate with the circumferential elastic element so that the circumferential elastic element is embedded in the receiving groove.

5. The sealing device according to claim 4, characterized in that, The first end of the elastic component is connected to the first sealed body; The second end of the elastic component is connected to the bottom surface of the root.

6. The sealing device according to claim 4, characterized in that, The first sealing surface and / or the second sealing surface are configured as tapered surfaces.

7. The sealing device according to claim 6, characterized in that, The coefficient of thermal expansion of the first spring is greater than that of the second spring; The first spring is disposed on the side of the second spring away from the root, and the second spring is in contact with the bottom surface of the root; The taper of the tapered surface gradually decreases along the direction from the opening of the receiving groove to the root.

8. The sealing device according to claim 6, characterized in that, The coefficient of thermal expansion of the first spring is smaller than that of the second spring; The first spring is disposed on the side of the second spring away from the root, and the second spring is in contact with the bottom surface of the root; The taper of the conical surface gradually increases along the direction from the opening of the receiving groove to the root.

9. The sealing device according to claim 6, characterized in that, The first sealing surface is a conical surface, and the second sealing surface is configured as a wavy curved surface; or The first sealing surface is configured as a wavy curved surface, and the second sealing surface is a conical surface.

10. The sealing device according to any one of claims 2 to 9, characterized in that, The first and second springs are respectively configured as plate-shaped structures; The first and second spring sheets are stacked and form a ring, which is disposed in the annular cavity and extends circumferentially therein; The projection of the second spring onto the first spring coincides with the first spring.

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